<div id="readability-page-1" class="page"><div><p>Certain hardware communication specifications require that positive numbers always be appended with a '+' value. So, in the intermediate JSON message, I implemented a positive number with a '+' and wrote code that deserializes it as a Java object. I ran into the following issues.</p>
<h2 id="problem">Problem</h2>
<p>In the process of deserializing the below Json string into a Java object using the Jackson library, the following error occurred.</p>
<p><img src="https://media.vlpt.us/images/joosing/post/f663c173-7ffa-42ab-b801-ff7ddc951ee4/image.png"></p>
<p><img src="https://media.vlpt.us/images/joosing/post/b5277513-4422-4d9a-962c-1a3b72209e2a/image.png"></p>
<blockquote>
<p>com.fasterxml.jackson.core.JsonParseException: Unexpected character ('3' (code 51)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value</p>
</blockquote>
<h2 id="cause">Cause</h2>
<p>The cause is the '+' sign to the positive 3.0 value highlighted below.<br>
<img src="https://media.vlpt.us/images/joosing/post/0f940a27-eb56-4129-82c8-18594c1d8075/image.png"></p>
<h2 id="conclusion">Conclusion</h2>
<p>When deserializing in the Jackson library, it seems that you should not add a sign to the positive number.</p></div></div>

Joo's Work

JooSing

Certain hardware communication specifications require that positive numbers always be appended with a '+' value. So, in the intermediate JSON message, I implemented a positive number with a '+' and wrote code that deserializes it as a Java object. I ran into the following issues.
Problem
In the process of deserializing the below Json string into a Java object using the Jackson library, the following error occurred.
com.fasterxml.jackson.core.JsonParseException: Unexpected character ('3' (code 51)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value
Cause
The cause is the '+' sign to the positive 3.0 value highlighted below. 
Conclusion
When deserializing in the Jackson library, it seems that you should not add a sign to the positive number.

Jackson Json parse error

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